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Leases - Minimum Future Lease Payments to be Received from Sales - Type and Direct Financing Leases (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Capital Leases, Future Minimum Payments Receivable, Fiscal Year Maturity [Abstract]  
2019 $ 4,264
2020 4,146
2021 2,777
2022 1,177
2023 335
Thereafter $ 523